:root {
    --bg-primary: #fafafa;
    --bg-secondary: #ffffff;
    --bg-soft: #f6f8fb;
    --border-light: #e2e8f0;
    --border-medium: #cbd5e0;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --text-muted: #a0aec0;
    --accent-blue: #4299e1;
    --accent-blue-hover: #3182ce;
    --accent-blue-soft: #ebf8ff;
    --success-soft: #e8f7ef;
    --warning-soft: #fff7df;
    --danger-soft: #fff1f2;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --space-1: .25rem;
    --space-2: .5rem;
    --space-3: .75rem;
    --space-4: 1rem;
    --space-5: 1.5rem;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
/* Modern Navbar */
.navbar {
    background-color: var(--bg-secondary) !important;
    border-bottom: 1px solid var(--border-light);
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.navbar-brand {
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--text-primary) !important;
    transition: color 0.2s ease;
}

.navbar-brand:hover {
    color: var(--accent-blue) !important;
}

.nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    margin: 0 0.5rem;
    padding: 0.5rem 1rem !important;
    border-radius: 8px;
    transition: all 0.2s ease;
    position: relative;
}

.nav-link:hover {
    background-color: #f7fafc;
    color: var(--accent-blue) !important;
}

.nav-link.active {
    background-color: var(--accent-blue-soft);
    color: var(--accent-blue) !important;
}

/* Main Container */
main {
    flex: 1;
    margin-top: 2rem;
    margin-bottom: 2rem;
}

.container {
    max-width: 1180px;
}

/* Footer */
footer {
    background-color: var(--bg-secondary) !important;
    border-top: 1px solid var(--border-light);
    color: var(--text-muted) !important;
    margin-top: auto;
}

/* Typography improvements */
h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.3;
}

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* Subtle animations */
.card,
.thumbnail,
.btn,
.nav-link {
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Cards and Containers */
.card,
.thumbnail-wrapper {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
    overflow: hidden;
}

.card:hover,
.thumbnail-wrapper:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--border-medium);
}

.card {
    padding: 1.5rem;
}

/* Thumbnail Improvements */
.thumbnail-wrapper {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background-color: var(--bg-secondary);
}

.thumbnail-wrapper h2 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
}

.thumbnail-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.thumbnail {
    flex: 0 1 150px;
    max-width: 150px;
    cursor: pointer;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.thumbnail:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-blue);
}

.thumbnail img {
    display: block;
    width: 100%;
    height: auto;
}

.document-name {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding: 0.75rem;
    background-color: #f7fafc;
    border-top: 1px solid var(--border-light);
    font-weight: 500;
}

/* Document Upload */
.document-previews {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.document-preview img {
    max-width: 100px;
    height: auto;
    border-radius: 6px;
    border: 1px solid var(--border-light);
}

.drop-zone {
    border: 2px dashed var(--border-medium);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    background-color: #f7fafc;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.drop-zone:hover {
    border-color: var(--accent-blue);
    background-color: #ebf8ff;
    color: var(--accent-blue);
}

.drop-zone.dragover {
    border-color: var(--accent-blue);
    background-color: #ebf8ff;
    color: var(--accent-blue);
    transform: scale(1.01);
}

.file-list {
    margin-top: 1rem;
}

.file-list ul {
    list-style: none;
    padding: 0;
}

.file-list li {
    padding: 0.75rem;
    background-color: #f7fafc;
    margin-bottom: 0.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Shared App/Admin UI */
.page-shell {
    display: grid;
    gap: var(--space-5);
}

.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-5);
}

.page-title {
    margin: 0;
    font-size: clamp(1.55rem, 2vw, 2.15rem);
    letter-spacing: 0;
}

.page-subtitle,
.help-text,
.text-muted {
    color: var(--text-secondary) !important;
}

.action-bar {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.ui-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--space-5);
}

.ui-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.empty-state {
    background: var(--bg-soft);
    border: 1px dashed var(--border-medium);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    padding: 1.5rem;
    text-align: center;
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-3);
}

.detail-item {
    background: var(--bg-soft);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: var(--space-4);
}

.detail-label {
    color: var(--text-secondary);
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .02em;
    margin-bottom: .35rem;
    text-transform: uppercase;
}

.detail-value {
    color: var(--text-primary);
    font-weight: 600;
    overflow-wrap: anywhere;
}

.document-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--space-4);
}

.technical-collapse summary {
    color: var(--text-secondary);
    cursor: pointer;
    font-size: .88rem;
    font-weight: 600;
}

.table {
    --bs-table-color: var(--text-primary);
    --bs-table-border-color: var(--border-light);
}

.table thead th {
    background: var(--bg-soft);
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-light);
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .02em;
    text-transform: uppercase;
}

.table td,
.table th {
    padding: .85rem .9rem;
}

.table-hover tbody tr:hover {
    background-color: #f8fbff;
}

.table-responsive {
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    box-shadow: var(--shadow-sm);
}

.table-responsive > .table {
    margin-bottom: 0;
}

.btn {
    border-radius: var(--radius-md);
    font-weight: 600;
}

.btn-primary {
    background-color: var(--accent-blue);
    border-color: var(--accent-blue);
}

.btn-primary:hover {
    background-color: var(--accent-blue-hover);
    border-color: var(--accent-blue-hover);
}

.btn-outline-danger {
    color: #b42318;
    border-color: #f3b8b3;
}

.badge {
    border-radius: 999px;
    font-weight: 650;
    padding: .4em .65em;
}

.alert {
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
}

.alert-success {
    background: var(--success-soft);
    border-color: #b7e4c7;
    color: #1f6f43;
}

.alert-warning {
    background: var(--warning-soft);
    border-color: #f3d58a;
    color: #7a5200;
}

.alert-danger {
    background: var(--danger-soft);
    border-color: #fecdd3;
    color: #9f1239;
}

.form-control,
.form-select,
select,
textarea,
input[type="text"],
input[type="number"],
input[type="email"],
input[type="password"] {
    border-color: var(--border-light);
    border-radius: var(--radius-md);
}

.form-control:focus,
.form-select:focus,
select:focus,
textarea:focus,
input:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 .2rem rgba(66, 153, 225, .18);
}

.tech-id,
.technical-id {
    color: var(--text-muted);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    font-size: .78rem;
    white-space: nowrap;
}

.status-muted {
    opacity: .65;
}

@media (max-width: 768px) {
    .navbar {
        padding: .75rem 0;
    }

    .nav-link {
        margin: .15rem 0;
    }

    main {
        margin-top: 1rem;
    }

    .page-header,
    .ui-card-header {
        display: grid;
        align-items: stretch;
    }

    .action-bar {
        justify-content: flex-start;
    }

    .ui-card {
        padding: var(--space-4);
    }
}